CN216645214U - Flange connecting bolt monitoring system based on capacitive displacement sensor - Google Patents
Flange connecting bolt monitoring system based on capacitive displacement sensor Download PDFInfo
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- CN216645214U CN216645214U CN202122895854.9U CN202122895854U CN216645214U CN 216645214 U CN216645214 U CN 216645214U CN 202122895854 U CN202122895854 U CN 202122895854U CN 216645214 U CN216645214 U CN 216645214U
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- displacement sensor
- flange
- monitoring system
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- stopper
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model provides a flange connection bolt monitoring system based on a capacitive displacement sensor, which comprises the capacitive displacement sensor, a fixed back plate, a limiting block, a transmission rod, a data acquisition instrument and a central processing unit, wherein the fixed back plate and the transmission rod are respectively fixed on two mutually connected flanges, a sensor fixing seat and a limiting block slideway are arranged on the fixed back plate, the capacitive displacement sensor is fixedly arranged on the sensor fixing seat, the limiting block is arranged on the limiting block slideway, the upper surface of the limiting block is parallel to the lower surface of the capacitive displacement sensor, the transmission rod is fixedly connected with the limiting block, and the maximum distance between the capacitive displacement sensor and the limiting block is larger than the maximum relative displacement between the two flanges when the bolt is in a complete loosening state or after the bolt is broken. The monitoring system has high sensitivity for monitoring the bolt loosening, high monitoring precision of the sensor, wide application range, low cost and convenient installation, and can be applied to large-size flanges.
Description
Technical Field
The utility model relates to a flange connecting bolt state online monitoring system, in particular to a flange connecting bolt monitoring system based on a capacitive displacement sensor.
Background
The flange connection refers to the detachable connection of a group of combined sealing structures formed by mutually connecting a flange, a gasket and a bolt, and the flange connection structure is extremely common in the current industrial field and is widely applied to the fields of wind power, chemical industry, metallurgy and the like. The flange connecting bolt can be loosened due to manufacturing defects, long-term alternating load or accidental large load influence exceeding the design range, the fastening state of the bolt directly influences the working performance of equipment, and serious equipment damage can be caused if the bolt is loosened or broken. Therefore, regular maintenance of the flange connection structure is very important, and in order to prevent the reduction or disappearance of the pretightening force of the bolts, checking the pretightening force of the bolts with a torque wrench is an important content of the regular maintenance. When the operation and maintenance is in remote areas or on the sea, the operation and maintenance work is time-consuming and labor-consuming, and in addition, the personal subjective and objective multi-factor influence of workers cannot ensure that the problem of bolt loosening is discovered and eliminated in time at each time, so that the bolt loosening needs to be monitored on line.
The technology of installing the sensor on the flange and monitoring whether the bolt is loosened or not by monitoring the state of the flange has the characteristics of simple and visual principle and high technical reliability, and existing manufacturers on the market develop research, development and application work in the aspect at present. For example, patent CN211504073U a flange connection bolt looseness monitoring system proposes a scheme of monitoring bolt looseness by monitoring flange clearance through a displacement sensor, but the technical scheme has the following disadvantages: (1) only when the flange bolt is seriously loosened or broken, a gap can be formed between the two flanges, and the displacement sensor can monitor the obvious displacement; when the bolt is less loosened and no gap exists between the two flanges, the scheme of monitoring the displacement of the flanges is not suitable at the moment; when a gap appears, the bolt loosening condition is very serious, and early warning cannot be given out at the first time. (2) The displacement sensor based on electromagnetic induction has a risk of magnetic decay after long-term use, and cannot be applied to a strong magnetic field environment.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides a flange connection bolt monitoring system based on a capacitive displacement sensor, which has high sensitivity for monitoring bolt looseness and high sensor monitoring precision, can be applied to large-size flanges, and has the advantages of wide application range, low cost and convenience in installation.
The technical scheme adopted for realizing the above purpose of the utility model is as follows:
a flange connection bolt monitoring system based on a capacitive displacement sensor comprises the capacitive displacement sensor, a data acquisition instrument and a central processing unit, wherein the capacitive displacement sensor is arranged on the inner circumference or the outer circumference of two mutually connected flanges, the capacitive displacement sensor is connected with the data acquisition instrument and transmits the detected displacement signal, the data acquisition instrument is connected with the central processing unit and transmits data, the flange connection bolt monitoring system also comprises a fixed back plate, a limiting block and a transmission rod, wherein the fixed back plate and the transmission rod are respectively fixed on the two mutually connected flanges, a sensor fixing seat and a limiting block slideway are arranged on the fixed back plate, the capacitive displacement sensor is fixedly arranged on the sensor fixing seat, the limiting block is movably arranged on the limiting block slideway and is positioned below the capacitive displacement sensor, the upper surface of the limiting block is parallel to the lower surface of the capacitive displacement sensor, the upper end of the transmission rod is fixedly connected with the lower end of the limiting block, the limiting block slides up and down in the limiting block slide way along with the transmission rod, and the maximum distance between the capacitive displacement sensor and the limiting block is larger than the maximum relative displacement between the two flanges in a complete loosening state of the bolt or after the bolt is broken.
The stopper is "T" style of calligraphy, and the both ends of stopper all are connected with the slide bar down, and the slide bar is installed on the stopper slide, and the transmission pole drives the slide bar and slides in the stopper slide.
The transfer rod is L-shaped, and the lower end of the transfer rod is fixedly connected with the bottom of the lower flange.
The transmission rod and the side face, close to the bottom, of the lower flange are fixedly connected through a cushion block, the thickness of the cushion block is larger than that of the fixed back plate, and the cushion block is fixedly connected with the flange and the transmission rod through bonding or magnetic force adsorption.
The fixed back plate is fixed on the side face, close to the top, of the upper flange.
The capacitance displacement sensor is provided with more than four inner circumferences or outer circumferences which are uniformly distributed on the flange.
And reinforcing ribs are embedded in the transmission rods.
The transmission rod is fixedly connected with the limiting block through bonding or magnetic adsorption.
The capacitance displacement sensor is fixedly arranged on the sensor fixing seat through bolt connection or bonding.
The fixed back plate is connected with the flange through bonding.
Compared with the prior art, the technical scheme provided by the utility model has the following advantages: 1. the utility model adopts the capacitance displacement sensor to monitor the distance change between the sensor and the limiting block, thereby monitoring the relative displacement between the upper flange and the lower flange, further monitoring the loosening or fracture state of the bolt, and the monitoring system has simple structure, convenient installation and high displacement monitoring precision which can reach micron level.
2. The capacitive displacement sensor is fixed on the side surface of the upper flange close to the top, the transmission rod is fixed on the side surface of the lower flange close to the bottom through the cushion block, so that the distance between the transmission rod and the fixed positions of the capacitive displacement sensor and the flange is maximized, the displacement between the side surface close to the top of the upper flange and the side surface close to the bottom of the lower flange is maximized under the condition that the flanges have the same overall relative displacement, the capacitive displacement sensor can monitor larger deformation, and the sensitivity of monitoring the bolt loosening or breaking state is improved.
3. According to the utility model, the sliding rods at two ends of the limiting block are arranged in the limiting block slideway on the fixed back plate, so that the upper surface of the limiting block and the lower surface of the capacitive displacement sensor can be always kept parallel, and the monitoring precision of the relative displacement change between the limiting block and the capacitive displacement sensor is further improved.
4. The transmission rod is simple in structure, the reinforcing ribs are embedded, the rigidity is high, monitoring errors caused by elastic deformation of the transmission rod are reduced, and for flanges and bolts with different sizes, matching and installation between a monitoring system and the flanges can be completed by selecting transmission rods with different lengths.
Drawings
FIG. 1 is a side view of a flange connecting bolt monitoring system of the present invention mounted on a flange;
FIG. 2 is an elevation view of a flange joint bolt monitoring system of the present invention mounted on a flange;
FIG. 3 is a structural diagram of a fixing back plate according to the present invention;
FIG. 4 is a structural diagram of a limiting block in the present invention;
FIG. 5 is a view showing the construction of a transfer lever according to the present invention;
wherein (a) and (b) are three-dimensional structure diagrams of the transfer rod in two different directions;
FIG. 6 is a schematic view of a connection structure of a capacitive displacement sensor and a limiting block on a fixed backplate according to the present invention;
wherein (a) is a schematic diagram when the limiting block is not installed with the transmission rod, and (b) is a schematic diagram when the limiting block and the transmission rod are installed;
FIG. 7 is a schematic diagram of the layout position of the capacitive displacement sensor on the flange according to the present invention;
in the figure: 1-upper flange, 2-lower flange, 3-connecting bolt, 4-capacitance displacement sensor, 5-fixed back plate, 6-limiting block, 7-transmission rod, 8-sensor fixing seat, 9-limiting block slideway, 10-sliding rod, 11-cushion block and 12-fixing bolt.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and drawings, but the scope of the present invention is not limited to the following embodiments.
The connecting bolt 3 is connected between the upper flange 1 and the lower flange 2, and when the connecting bolt is loosened or broken, the pretightening force between the upper flange and the lower flange is reduced, so that relative displacement is generated. The flange connection bolt monitoring system based on the capacitive displacement sensor provided by the embodiment realizes the state monitoring of the flange connection bolt by monitoring the relative displacement between the upper flange and the lower flange.
The flange connection bolt monitoring system based on the capacitive displacement sensor comprises a capacitive displacement sensor 4, a fixed back plate 5, a limiting block 6, a transmission rod 7, a data acquisition instrument and a central processing unit. The capacitive displacement sensor, the fixed back plate, the limiting block and the transmission rod are all mounted on the inner circumference or the outer circumference of the flange, and the mounting structure of the capacitive displacement sensor, the fixed back plate, the limiting block and the transmission rod is shown in figures 1 and 2.
In this embodiment, one surface of the fixed backboard is fixedly connected to the side surface of the upper flange near the top by bonding, and the other surface of the fixed backboard is provided with a sensor fixing seat 8 and a limiting block slideway 9, and the structure of the fixed backboard is shown in fig. 3. The capacitance displacement sensor is fixedly arranged on the sensor fixing seat through bolt connection or bonding.
The structure of stopper in this embodiment is as shown in fig. 4, "T" style of calligraphy, and the both ends of stopper all are connected with slide bar 10 down, and the slide bar is installed on the stopper slide and can slide from top to bottom in the slide, makes the stopper be located capacitanc displacement sensor's below, and the upper surface of stopper and capacitanc displacement sensor's lower surface are parallel to each other, as shown in fig. 2. The limiting block slide ways are correspondingly provided with two sliding rods according to the number of the sliding rods, so that the upper surface of the limiting block and the lower surface of the capacitive displacement sensor can be always kept parallel, and the monitoring precision of the relative displacement change between the limiting block slide ways and the capacitive displacement sensor is further improved.
The transmission pole is "L" style of calligraphy in this embodiment, the lower extreme of transmission pole is connected fixedly with the bottom of lower flange, the transmission pole is connected fixedly through cushion 11 with lower flange between being close to the side of bottom, specifically, the cushion passes through bonding or magnetic force absorption and flange and transmission pole fixed connection, the thickness of cushion is greater than the thickness of fixed back plate, the setting of cushion makes the distance maximize between the fixed position of transmission pole and capacitive displacement sensor and flange, under the condition that the same relative displacement volume appears in the flange is whole, the displacement volume between the side that is close to the upper flange top and the side that is close to lower flange bottom is the biggest, the capacitive displacement sensor can monitor bigger deflection, improve the sensitivity to bolt looseness or fracture state monitoring. The transmission rod is embedded with a reinforcing rib to improve the rigidity of the transmission rod and reduce the monitoring error caused by the elastic deformation of the transmission rod, and the structure of the transmission rod is shown in figure 5. For flanges and bolts with different sizes, the matching and installation between the detection system and the flanges can be completed by selecting transfer rods with different lengths.
The upper end of the transmission rod is fixedly connected with the lower end of the limiting block through bonding or magnetic force adsorption, and the limiting block slides up and down in the limiting block slide way along with the transmission rod. When the bolt is loosened or broken, relative displacement occurs between the upper flange and the lower flange, the limiting block and the transfer rod move along with the lower flange, the fixed back plate and the capacitive displacement sensor move along with the upper flange, relative displacement between the lower surface of the capacitive displacement sensor and the upper surface of the limiting block can be increased, the capacitive displacement sensor can monitor the relative displacement variation between the lower surface of the capacitive displacement sensor and the upper surface of the limiting block in real time, and the testing precision of the capacitive displacement sensor in the embodiment can reach a micron level.
The distance between the capacitive displacement sensor and the limiting block is related to the conditions of the upper flange, the lower flange, the size and the material of the bolt, the load size and the like, but the maximum distance between the capacitive displacement sensor and the limiting block (at the moment, the limiting block cannot continuously slide downwards on the limiting block slideway) needs to be ensured to be larger than the maximum relative displacement between the two flanges in a bolt complete loosening state or after the bolt is broken, and the maximum distance depends on the vertical distance between the sensor fixing seat and the limiting block slideway. When the limiting block is not installed with the transmission rod, the limiting block is hung on the limiting block slide rail through the slide rod, and the distance L between the capacitive displacement sensor and the limiting block is larger than the distance L between the capacitive displacement sensor and the limiting block0Max, as shown in fig. 6 (a); after the transmission rod is fixedly connected with the limiting block and fixed on the lower flange, the limiting block is pushed upwards by the transmission rod to be close to the capacitive displacement sensor, and the distance between the capacitive displacement sensor and the limiting block is L at the moment, as shown in fig. 6 (b). Therefore, when the flanges are displaced relatively, the transmission rod drives the limiting block to slide downwards.
The capacitive displacement sensors in this embodiment are provided with four or more and evenly distributed on the inner or outer circumference on the flange, as shown in fig. 7. The capacitance displacement sensor is connected with the data acquisition instrument through CAN communication, 485 communication or Ethernet and transmits the measured displacement signal, and the data acquisition instrument is connected with the central processing unit through a wired or wireless mode and transmits data, so that the monitoring of the flange connecting bolt monitoring system on the connecting bolt is realized.
The installation steps of capacitanc displacement sensor, fixed backplate, stopper and transmission pole among the flange joint bolt monitoring system that this embodiment provided are: (1) fixing a fixed back plate on the side surface of the upper flange close to the top, installing a capacitive displacement sensor on a sensor fixing seat through a fixing bolt 12, and movably installing a limiting block on a limiting block slideway, as shown in fig. 6 (a);
(2) the lower end of the transmission rod is fixedly connected with the lower surface of the lower flange, and the transmission rod is fixedly connected with the side surface, close to the bottom, of the lower flange through a cushion block;
(3) the lower end of the limiting block and the upper end of the transmission rod are connected and fixed, as shown in fig. 6 (b).
Claims (10)
1. The utility model provides a flange joint bolt monitoring system based on capacitanc displacement sensor, includes capacitanc displacement sensor, data acquisition appearance and central processing unit, and wherein capacitanc displacement sensor installs on the interior circumference or the outer circumference of two interconnect's flanges, and capacitanc displacement sensor is connected and transmits the displacement signal that records with the data acquisition appearance, and the data acquisition appearance is connected and transmits data, its characterized in that with central processing unit: the flange joint bolt monitoring system still includes fixed backplate, stopper and transmission pole, wherein fixed backplate and transmission pole are fixed in on two interconnect's flange respectively, be provided with sensor fixing base and stopper slide on the fixed backplate, capacitanc displacement sensor fixed mounting is on the sensor fixing base, stopper movable mounting is on the stopper slide and lie in capacitanc displacement sensor's below, the upper surface of stopper and capacitanc displacement sensor's lower surface are parallel to each other, the upper end of transmission pole is connected fixedly with the lower extreme of stopper, make the stopper slide from top to bottom in the stopper slide along with the transmission pole, the maximum distance between capacitanc displacement sensor and the stopper is greater than the complete not hard up state of bolt or the biggest relative displacement volume between two flanges after the bolt fracture.
2. The capacitive displacement sensor-based flange connection bolt monitoring system of claim 1, wherein: the stopper is "T" style of calligraphy, and the both ends of stopper all are connected with the slide bar down, and the slide bar is installed on the stopper slide, and the transmission pole drives the slide bar and slides in the stopper slide.
3. The capacitive displacement sensor-based flange joint bolt monitoring system of claim 1, wherein: the transfer rod is L-shaped, and the lower end of the transfer rod is fixedly connected with the bottom of the lower flange.
4. The capacitive displacement sensor-based flange connection bolt monitoring system of claim 1, wherein: the transmission rod and the side face, close to the bottom, of the lower flange are fixedly connected through a cushion block, the thickness of the cushion block is larger than that of the fixed back plate, and the cushion block is fixedly connected with the flange and the transmission rod through bonding or magnetic force adsorption.
5. The capacitive displacement sensor-based flange joint bolt monitoring system of claim 1, wherein: the fixed back plate is fixed on the side face, close to the top, of the upper flange.
6. The capacitive displacement sensor-based flange connection bolt monitoring system of claim 1, wherein: the capacitance type displacement sensor is provided with more than four inner circumferences or outer circumferences which are uniformly distributed on the flange.
7. The capacitive displacement sensor-based flange connection bolt monitoring system of claim 1, wherein: and reinforcing ribs are embedded in the transmission rods.
8. The capacitive displacement sensor-based flange connection bolt monitoring system of claim 1, wherein: the transmission rod is fixedly connected with the limiting block through bonding or magnetic adsorption.
9. The capacitive displacement sensor-based flange connection bolt monitoring system of claim 1, wherein: the capacitance displacement sensor is fixedly arranged on the sensor fixing seat through bolt connection or bonding.
10. The capacitive displacement sensor-based flange joint bolt monitoring system of claim 1, wherein: the fixed back plate is connected with the flange through bonding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122895854.9U CN216645214U (en) | 2021-11-24 | 2021-11-24 | Flange connecting bolt monitoring system based on capacitive displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122895854.9U CN216645214U (en) | 2021-11-24 | 2021-11-24 | Flange connecting bolt monitoring system based on capacitive displacement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216645214U true CN216645214U (en) | 2022-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122895854.9U Active CN216645214U (en) | 2021-11-24 | 2021-11-24 | Flange connecting bolt monitoring system based on capacitive displacement sensor |
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| Country | Link |
|---|---|
| CN (1) | CN216645214U (en) |
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2021
- 2021-11-24 CN CN202122895854.9U patent/CN216645214U/en active Active
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